query_processing_and_optimization

1.To solve that problem, OODT provides transparent access to distributed resources, functionality for data discovery and query optimization, as well as distributed processing and virtual archives.
为了解决那个问题，OODT提供了对分布式资源的透明访问、数据恢复和查询优化功能以及分布式处理和虚拟存档。
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2.In the distributed query optimization, both local processing cost and transmission cost should be thought over simultaneously.
在分布式查询优化中，应同时考虑本地处理代价和传输代价。
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3.Query optimization and processing is a critical component of parallel database systems.
查询优化和处理是并行数据库管理系统的关键组成部分。
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